Core-oven.



C. P. FRBDB &'H. M. PFLAGER.,

CORE OVEN.

APPLIOATION FILED Mu, 1911.

1,029,986.. Patented June 18, 1912.

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CORE OVEN.

APPLIOATION FILED MAY s, 1911.

lwa@ Patented Jungla, 1912.

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` furla/#1101215 G. F. FREDE & H. M. PFLAGER. GRE OVEN.

APPLIOATION FILED MAY 5, 1911.

1,029.986. Patented June 18,1912.

3 SHEETS-SHEET 3.

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CHARLES iF. FBEDE .AND HARRY M. IPFLG'ERfOT 'S'.l. CUOUS, MSSOUB, ASSIGNORS TO COMMONWEALTH STEEL COMPANY, OF ST. IOUS, MISSOURI, A CORPORATION F MISSOURI. Y

spaanse.

fORE-OVEN.

Patented lune 18, i912.

Application filed May 5,. 1911. SerialNo. 625,361.

To all whom t may concern.'

Be it known that we, ICHARLES F. Frans and HARRY M. PFLAGER, citizens of the United States, residing at St. Louis, Missouri, have inventeda certain new and useful Improvement in Core-Ovens, of which the following is a full, clear, and exact description, such as Will enable .others skilled in the art to which it appertains to make and use lthe same, reference being had to the accompanying drawings, formingpart of this specification, in Which- Figure 1 is a vertical longitudinal section through our improved coreoven on line 1-1 in Fig. 2. Fig. 2 is .an end elevation of one oven, and a vertical transverse section through an adjoining duplicate oven, which section is taken on the line 2 2 l. Fig. 3 is a horizontal section .through the oven on line 3-3 of Figs. land 2. F ig. 4 is a vertical longitudinal` section on enlarged scale, through one of fthe'rack supporting Irollers forming part of our inven tion, and taken k on line 4 4, Fig.' 1. 25s5 is a vertical transverse section taken on the line' 5-5 of Fig. 4. Fig. I6 is a cross section dn enlarged scale-through-one of the hinged door flaps seen in Fig. 1, and forming part of our invention;C u

Our .invention relates to yovens for or drying mold cores and the like.

Ordinarily, an oven of this class comprises a drying chamber which is heated .from a suitable furnace' in communication 35 therewith, the walls 'of the chamber being lined with tire-brick and its entrance opened and closed by a sliding door suspended by chains Whichv are passed over pulleys and a@ baking provided at their free ends with counterbalw ancing Weights. The cores to' be baked' or dried are initially placed on the outside of. the oven on a series of racks arrangedcollectively one above the other 'in a frame mounted on Wheels, the whole being then run back into the oven and the oven door closed. On completion of the baking procfessthe door is opened and the frame carrying the dried cores is withdrawn from the voven. The disadvantages of this arranger ment are that, in charging the oven and removing the baked cores therefrom, it is necessaryV to fully open the oven door which causes considerable loss of heat from the oven; also, owing to their varying size and character, some ofthe cores require less time to bake than ot-hers, and to remove them from the oven when baked necessitates Opening the door and'prematurely removlng ithe other cores therewith, which causes loss of heat yboth from these unbaked cores and from the oven, besides a waste of time and labor.

our improved core .oven (shown 1n duplicate adjonin z each other side by side in Fig. 2),'Whic consists preferably, of a rectangular-shaped drying chamber a for receiving the cores to be baked, said chamber belng preferably openyat each end, and its Walls being', lined with "fire-brick or other suitable refractory material'. l

Beneath the chamber aV is arranged a suitable furnace b which is covered and separated from the lower partof the chamber aby alire-brick varch l, through which are from' the furnace into the drying chamber a, .and from which' they are allowed to escapeeither through the flue 3 (Figs. 2 and 3) in the side Wall4 and stack 4', or through the iue 5 at the top of the chamber a (the flue 3 in such case being closed by the dampers 6 above-the oven A'as shown) into the overhead flue` pipe or chimney 7. The gases from the chamber a may be allowed to pass through 'both the flues 3 and 5 simultaneously if desired.

Extending.. longitudinally through the drying chamber a 1s a series of racks or core frames c which are arranged horizontally, one aboveth'eother, at avsuitable distance from e-acltgotherfandfrom .the top and bottom of th'egendfopen'ings ofthe chamber a,

Aeach rackc having `a length over 'twice the length ofy the 'c hamben-iso that when in operation 'as hereinaftervmorej particularly referredV to,vth;e end. portions of -the rack c will projectthroughfthe-said openings beyond the en'd of the :oven A. Each rack c in thefpresent case, .consi sts .preferably of two side longitudinal I-beams, and two in- .formed vertical openings 2 for the passage therethrough of theproducts of combustion than the inside width of the drying chamber a.' Each rack cis supported and adapted to ride longitudinally on a series of suitable anti-friction rollers arranged preferably as follows: Beneatheach side (the side beam 8 in this case) of the rackc on the outside of the oven A adjacent to each end opening of the chamber a, is a roller d which is adapted to bear against the underside of the rack c, said roller being axially mounted in a sultable bearing 11 fixed to an upright member 12 which is preferably spaced apart lfrom the corresponding end of the oven A, and connected at the top above the latter to the corresponding upright 12 at the other end of the oven by a horizontal beam 13.

The frame composed of the members 12 and 13 is supported at the base on suitable .foundations 14 formed either by the brickwork setting of the oven A as shown, or independently thereof in any suitable manner. Furthermore, each rack c is adapted to be similarly supported by and ride at its end portions on rollers d which are arranged in alinement with the rollers d at a sultable distance therefrom and axially'mounted in bea-rings 11 fixed to the upright members 12 which 'are supported at t eir base on suitable foundations 14' as shown, or otherwise as found most suitable.

Across the top of each lrack c in the middle and adjacent to each end thereof respectively, is fixed or formed an upright plate or membere, e', which forms a door or apron adapted for opening and closing a corresponding portion of the end openings of the chamber a, the distance between the middle door e and each end door e being equal to the length of the chamber a between its said openings, whereby, on moving the rack c longitudinally to its extreme position in either direction, the middle door e closes that portion of the end opening of the chamber a above the rack c at the end ofthe oven A to which the rack c is moved and at the same time the `end doors e close to a similar extent, the opposite end openin of the chamber a, that part ofn the rack c etween the middle door e and the said end door e being within the drying chamber a, while that part of the rack c between the middle door c and the other end door e projects beyond the oven A; in other words, by using a series of independently operatedracks c having one-half of each rack c loaded with cores within the oven A while its other half is outside the oven A ready for being charged, combined with the automatic opening and closing of the oven A by doors e movable with the racks c, considerable time Suitable handles 15 and 16 are preferably fixed to the ends ofthe racks c, whereby the latter are moved longitudinally on their rollers d, and d in either direction through the oven A.-

To provide suiiicient clearance for the doors e, e', at the top, in the movement of the racks c to and fro beneath each other, and at t-he same time insure the proper closing of the oven openings by the doors e, e', we preferably use a series of horizontally arrangedlat bars or flaps f (seen particularly in Fig. 6),. which depend from and are hinged along their upper edges to the undersides of thel racks c in the plane of the doors e, e', and in the path of the moving racks c, whereby the doors e, ef, in clos.

ing the opening of the oven A engage the hinged flaps f and form therewith a practically tight closing of the said openings. The doors e, e when moved from their closed-position, displace the flaps f about their hlnges until the doors e, e are clear, whereupon the aps f will swing back to their normal positions.

Our improved oven is comparatively simple in construction and operation, conserves and economizes the heat, and by the use .ot the improved oven much time and labor are saved in baking and drying mold cores, and the like. v

It will be readily understood thatminor changes in the form, size and construction of our improved oven may be made and substituted for those herein shown and described without departing rom the spirit of our invention, the scope-of which is set forth in the appended claims.

We claim:

1. In a core oven, a drying chamber having opposite door openings, a series of racks arranged one above the other and adapted respectively to support a core, and to be moved in opposite directions through the said openings, roller sup orts for the racks, vertically disposed mem ers projecting upward from the racks for closing the said openings in the different ositions of the racks, and hinged iaps `epending ,from each rack for engagement with the upper edges of the vertically disposed members of the lower succeeding rack.

2,. In a 'core oven, a drying chamber havwardly ,from the rack and a corresponding series of hinged flaps depending from the rack, and roller bearings arranged on opposite sides of the chamber at suitable distances vtherefrom for support-ing the outer end of the rack. l

4. In a core oven, a drying chamber hav.- ingdoor openings formed in two opposite walls, a rack adapted to support a core and movable in opposite directions through the openings in the chamber and means carried by said rack for closing the openings in the different positions of the rack, which means comprises parts rigidly fixed to the rack and corresponding parts hinged to the rack.

5. In a core oven,` the combination with adrying chamber having door openings in two opposite walls, of a rack movable in opposite directions through said openings and a series of members hinged to and-depending from said rack for partially closing the door openings in the dierentpositions of the rack. n

6. In a core oven, the combinatlon wlth a chamber having door openings in two opposite walls, of a pair of racks arranged one above lthe other movable in opposite directions through the door openings, a series of.

upwardly projecting'plates carried by the lower one of the racks, and a corresponding series of hinged members depending from the upper one of the racks which hinged members coperate with the plates for c1os ing the door openings in the dierent positions of the racks. i

In testimony whereof we hereunto ahx our signatures in the 0 nesses, this 25th day o Aprll, 1911.

CHARLES l?.v FREDE. HARRY M. PFLAGER.` Witnesses:

C. G. WESTLAKE, HAL C. BELLVILLE.

resence of two wit- 

